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Merostomata

   Also found in: Encyclopedia, Wikipedia 0.04 sec.
Mer`o`stom´a`ta
prop. n. p1.(Zool.) A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs (Limulus) of the last group. See Limulus.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.Merostomata - used in some classifications; includes the orders Xiphosura and Eurypterida
class Merostomata
arthropod - invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
Chelicerata, superclass Chelicerata - spiders; scorpions; horseshoe crabs
order Xiphosura, Xiphosura - horseshoe crabs and extinct forms
Eurypterida, order Eurypterida - extinct aquatic arthropods of the Paleozoic


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